KR20090038184A - Developer cartridge, developing device and image forming apparatus - Google Patents

Abstract

A developer cartridge, a developing device and an image forming apparatus are provided to rotate agitating units, which are installed at a storage space, based on time difference to disperse the load applied to the agitating units, consequently the damage of the agitating units. A power transmission member(320) and a rotating member(330) include position determining units which are a criterion for adjusting a combining position. The position determining unit of the rotating member comprises a position determining hole(334) which passes through the rotational member in an axial direction, and the position determining unit of the power transmission member comprises a position determining hole(325), which passes the power transmission member in an axial direction, at a place where it corresponds to the rotating member. The rotating member includes an elastic part(335) at its circumference, and the power transmission member includes a combining recess(326) at an inner portion of a holding unit by corresponding to the elastic part.

Description

Developer cartridge, developer and image forming apparatus {DEVELOPER CARTRIDGE, DEVELOPING DEVICE AND IMAGE FORMING APPARATUS}

The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus in which an agitation unit for stirring a developer is not overloaded.

Image forming apparatuses such as printers, copiers and fax machines form images on a print medium according to input image signals. An electrophotographic image forming apparatus, which is a type of image forming apparatus, scans a photosensitive member charged to a predetermined potential to form an electrostatic latent image on its outer circumferential surface, and develops a visible image by adding a developer to the electrostatic latent image. This is transferred to and fixed on a print medium to print an image.

The developing apparatus of such an image forming apparatus includes a developer storage chamber in which a developer to be supplied to a photosensitive member is stored. The developer storage chamber may be provided in one process cartridge together with main components necessary for development or in a separate cartridge form separate from other main components.

Whether the developer storage chamber is provided in one process cartridge or constitutes a separate developer cartridge, a stirring unit for agitating the developer is installed in the developer storage chamber. The stirring unit receives power from a drive source installed in the main body of the image forming apparatus, rotates inside the developer storage chamber, and agitates the developer.

However, depending on the state of the developer stored in the developer storage room, a situation may occur where the stirring unit is overloaded. For example, in the process of transporting a process cartridge or a developer cartridge, the stirring unit is rotated in a state in which the developer stored therein is driven to one side by shock or vibration, or the developer is agglomerated by high humidity.

In such a situation, if the agitation unit is overloaded, the agitation unit may be broken or a motor driving the agitation unit may be damaged, thus preventing the developer from properly stirring or transferring the developer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to improve the developer cartridge, the developing device and the image forming apparatus having the improved so as not to overload the stirring unit for agitating the developer even in a situation in which the developer is agglomerated To provide.

The developer cartridge according to the present invention for achieving the above object is a housing having a developer storage chamber; and a first stirring unit rotatably installed in the housing; and the first stirring unit rotatably installed in the housing. And a second stirring unit which starts to rotate at a time difference with the second stirring unit.

The second stirring unit has a rotating shaft, the developer cartridge according to the present invention may further include a rotating member coupled to one end of the rotating shaft, and a power transmission member for transmitting a rotational force to the rotating member after rotating a predetermined angle. have.

The rotating member and the power transmission member may be coaxially coupled.

The power transmission member may have a locking portion for transmitting power to the rotating member, and the rotating member may have an interference portion that interferes with the locking portion.

The rotation member and the power transmission member may each include a positioning unit for adjusting the position when the rotation member and the power transmission member are coupled to each other.

The rotating member may have an elastic piece formed on one side of the circumference thereof, and the power transmission member may have a coupling groove coupled with the elastic piece.

The developer storage chamber may include a developer discharge part through which a developer is discharged, and the first stirring unit may be located closer to the developer discharge part than the second stirring unit.

Meanwhile, the first stirring unit and the second stirring unit may be driven by a single driving source.

In addition, the developing apparatus according to the present invention includes a developer storage chamber; and a first stirring unit and a second stirring unit for stirring the developer in the developer storage chamber; and a power for transmitting rotational force to the first stirring unit and the second stirring unit. And a power transmission member for transmitting power to the second stirring unit, and a power transmission member for transmitting power to the first stirring unit and the rotating member. Is characterized in that for transmitting power to the rotating member after idling at a predetermined angle in relation to the rotating member.

The second stirring unit has a rotating shaft, the rotating member is coaxially coupled to one end of the rotating shaft, the power transmission member may be rotatably coupled to the rotating member.

The power transmission unit further includes a power transmission gear for transmitting power to the first stirring unit, wherein the power transmission member includes a gear part for transmitting power to the power transmission gear, and a receiving part for receiving the rotation member. It can be provided.

The power transmission member may further include a locking protrusion formed in the accommodation portion, and the rotation member may include an interference protrusion that interferes with the locking protrusion in a state where the power transmission member is rotated by a predetermined angle.

The rotating member may include a first positioning hole, and the power transmission member may include a second positioning hole corresponding to the first positioning hole.

In addition, the image forming apparatus according to the present invention comprises: a developer storage chamber; a first stirring unit and a second stirring unit rotating in the developer storage chamber and stirring the developer; and driving the first stirring unit and the second stirring unit. And a power transmission gear for transmitting power to the first stirring unit; and a rotating member for transmitting power to the second stirring unit; and a time difference between the power transmission gear and the rotating member. It is characterized in that it comprises a power transmission member for transmitting and leaving.

The rotating member and the power transmission member are coupled coaxially, the power transmission member has a locking projection for transmitting power to the rotating member, the rotating member is spaced apart from the locking projection along the rotation direction of the power transmission member. Interference protrusions can be provided.

The rotating member includes an elastic piece having a first positioning hole and a hook, and the power transmission member has a second positioning hole and the elastic piece when the positions of the first positioning hole and the second positioning hole are aligned. It may have a coupling groove for engaging with the hook.

The present invention allows the stirring units installed in the developer storage chamber to rotate at different time intervals so as to distribute the load on the stirring units, thereby preventing the stirring units, the driving source, or the members connecting the driving source and the stirring unit from being broken by overload. It can prevent.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 1 is a cross-sectional view showing the configuration of an image forming apparatus according to the present invention.

As shown in FIG. 1, the image forming apparatus according to the present invention has a main body 10 for supporting various components installed therein while forming an appearance. The paper feeding device 20, the optical scanning device 30, the developing device 40, the transfer device 50, the fixing device 60, and the discharge device 70 are installed inside the main body 10.

The paper feeding device 20 supplies the paper S, which is a print medium, toward the developing device 40. The paper feeding device 20 includes a paper feed tray 21 on which paper S is loaded, a pickup roller 22 for picking up the sheets of paper loaded in the paper tray 21 one by one, and a pickup roller 22. It comprises a feed roller 23 for feeding the paper toward the developing device 40.

The developing apparatus 40 includes a developing unit 100 and a developer cartridge 200. The developing unit 100 includes main components for performing a developing process to develop an electrostatic latent image formed on the photosensitive member 110 as a visible image. The developer cartridge 200 stores a developer to be supplied to the developing unit 100. When the developer stored in the developer cartridge 200 is used up, the user can replace only the developer cartridge separately from the developing unit 100. A detailed description of the configuration of the developer cartridge 200 will be described later.

In the developing unit 100, a photosensitive member 110, a charging roller 120, a developing roller 130, a supply roller 140, and a developer conveying body 150 are installed. The charging roller 120 charges the surface of the photosensitive member 110 to a predetermined potential. When the optical scanning device 30 scans light corresponding to image information on the surface of the photoconductor 110 charged to a predetermined potential, an electrostatic latent image is formed on the surface of the photoconductor 110.

The developer conveying member 150 conveys the developer supplied from the developer cartridge 200 toward the supply roller 140, and the supply roller 140 supplies the developer to the developing roller 130. The developing roller 130 supplies a developer to the surface of the photosensitive member 110 on which the electrostatic latent image is formed to develop the electrostatic latent image as a visible image.

The transfer device 50 transfers the visible image formed on the photoconductor 110 to paper. The transfer device 50 may be composed of a transfer roller 51 installed in the main body 10 to face the photosensitive member 110. The transfer roller 51 presses the paper toward the photoconductor 110 so that the visible image of the surface of the photoconductor 110 is transferred to the paper.

The fixing device 60 fixes the image transferred to the paper onto the paper. The fixing device 60 includes a heating roller 61 having a heat source installed therein, and a pressure roller 62 pressurized to the heating roller 61 at a predetermined pressure. When the paper passes between the heating roller 61 and the pressure roller 62, the image is fixed to the paper by the heat transmitted from the heating roller 61 and the pressure acting between the heating roller 61 and the pressure roller 62. do.

The discharge device 70 includes a first medium roller 71 and a second medium roller 71 to discharge the paper passing through the fixing device 60 to the outside of the main body 10.

Figure 2 is a perspective view showing the configuration of a developer cartridge according to the present invention, Figure 3 is an enlarged view by extracting a part of the configuration in FIG.

1 and 2, the developer cartridge 200 includes a housing 210 in which a developer storage chamber 210a is provided. At one side of the developer storage chamber 210a, a developer discharge part 211 for supplying the developer to the developer inlet 160 of the developing unit 100 is formed.

In addition, the developer cartridge 200 transfers the first stirring unit 220 and the second stirring unit 230 for stirring the developer in the developer storage chamber 210a and the developer toward the developer discharge part 211. It is provided with a transfer unit 240 (see FIG. 1). 2, the transfer unit is omitted for convenience. The second stirring unit 230 agitates the surrounding developer and simultaneously transfers the developer toward the first stirring unit 220. Similarly, the first stirring unit 220 agitates the surrounding developer and simultaneously transfers the developer toward the transfer unit 240. The developer around the transfer unit 240 is transferred to the developer discharge part 211 by the transfer unit 240 and discharged to the developer inlet 160 of the developing unit 100.

The first stirring unit 220 and the second stirring unit 230 have rotation shafts 221 and 231, respectively, and are rotatably installed in the housing 210. One end of the rotating shaft 221 of the first stirring unit 220 and the rotating shaft 231 of the second stirring unit 230 extends to the outer side of the housing 210.

The first stirring unit 220 has a plurality of extension ribs 222 extending radially from the rotation axis 221. The extension ribs 222 are disposed in the axial direction of the rotation shaft 221 at intervals. Some of the extension ribs 222 extend in the first direction from the rotation shaft 221, and others extend in a direction opposite to the first direction. Connection ribs 223 extending in the axial direction of the rotary shaft 221 are disposed at the ends of the extension ribs 222, and the stirring rib 223 is attached to the connection ribs 223 to effectively stir the developer. do. In the same manner, the second stirring unit 230 includes a plurality of extension ribs 232, a connecting rib 233 extending in the axial direction of the rotation shaft 231 at an end of the extension rib 232, and a connecting rib 233. A stirring film 234 is attached to the).

In addition, the developer cartridge 200 includes a power transmission unit 300 that transmits rotational force to the first stirring unit 220 and the second stirring unit 230. In the present invention, the power transmission unit 300 is configured such that the second stirring unit 230 rotates at a time difference with the first stirring unit 220. The power transmission unit 300 transmits power to the first stirring unit 220 to rotate the first stirring unit 220 first, and then transfers power to the second stirring unit 230 after a predetermined time passes, thereby stirring the second stirring unit 220. Rotate the unit 230.

As such, when the first stirring unit 220 and the second stirring unit 230 are rotated with a time difference from each other, the second stirring unit (with the developer agglomeration phenomenon partially resolved by the first stirring unit 220) Since the 230 starts to rotate, the load on the first stirring unit 220 and the second stirring unit 230 is reduced compared to when the first stirring unit 220 and the second stirring unit 230 start rotating at the same time. Can be.

In other words, when the agitation is started for the first time in a state in which the developer is agglomerated, the agitation unit takes the largest load. At this time, when the first agitator unit 220 and the second agitator unit 230 are rotated at the same time, the developer is bound. Both agitation units will be heavily loaded at once. However, when the first stirring unit 220 is rotated first to solve some of the developer agglomeration, the second stirring unit 230 does not take a large load when the second stirring unit 230 starts to rotate. Excessive load is applied to the first stirring unit 220 and the second stirring unit 230 so as not to occur.

The main body 10 of the image forming apparatus includes a driving source 11 for driving the first stirring unit 220 and the second stirring unit 230, and connected to the driving source 11 through a series of gear trains (not shown). The drive coupler 12 is installed.

2 and 3, the power transmission unit 300 includes a driven coupler 310 coupled to the drive coupler 12 when the developer cartridge 200 is mounted to the main body 10, and a driven coupler. Power transmission member 320 that receives power from the rotation 310 and rotates, Rotation member 330 to receive power from the power transmission member 320 to the second stirring unit 230, and a power transmission member ( It may be configured to include a power transmission gear 340 to receive the power from the 320 to transfer to the first stirring unit 220.

The power transmission gear 340 is coaxially coupled to one end of the rotation shaft 221 of the first stirring unit 220. The power transmission gear 340 is engaged with the connection gear 350, and the connection gear 350 is engaged with the gear part 321 of the power transmission member 320. In addition, the gear part 321 of the power transmission member 320 meshes with the gear part 311 of the driven coupler 310. Therefore, when the driven coupler 310 rotates, the power transmission member 320 rotates, and the rotational force of the power transmission member 320 is transmitted to the power transmission gear 340 as it is through the connection gear 350.

4 and 5 are a front perspective view and a rear perspective view showing a state in which the rotating shaft, the rotating member and the power transmission member of the second stirring unit in the present invention is coupled. 6 is a view showing the positional relationship between the rotating member and the power transmission member before the rotating member and the power transmission member are driven.

4 and 5, the rotating member 330 is coaxially coupled to the rotating shaft 231 of the second stirring unit 230, and the power transmission member 320 is rotatable to the rotating member 330. To be combined.

One end of the rotating shaft 231 of the second stirring unit 230 is formed with a cutting portion 231a, the rotating member 330 is a coupling boss formed with a shaft coupling hole (331a) for coupling with the cutting portion (231a) ( 331). The power transmission member 320 is coaxially coupled to the rotating member 330 and has a receiving portion 322 for receiving the rotating member 330. In the center of the receiving portion 322 is provided a boss receiving portion 323 protruding toward the rotating member 330. The boss accommodating part 323 has a boss insertion hole 323a, and the coupling boss 331 is inserted into the boss insertion hole 323a so that the power transmission member 320 is rotatably coupled to the rotation member 330. .

The power transmission member 320 has a locking portion 324 for transmitting power to the rotating member 330, the rotating member 330 has an interference portion 332 to interfere with the locking portion 324. Before the power transmission member 320 and the rotation member 330 are driven for the first time, the engaging portion 324 of the power transmission member and the interference portion 332 of the rotation member 330 may rotate in the direction of rotation of the power transmission member 320 (Fig. In the direction A of 6). That is, the locking portion 324 of the power transmission member 320 is positioned to interfere with the interference portion 332 of the rotating member 330 after rotating the predetermined angle. Therefore, even if the power transmission member 320 rotates, power is not transmitted to the rotating member 330 for a predetermined time.

The locking portion 324 of the power transmission member 320 may be configured as a locking protrusion 324a protruding in the radial direction from the outer circumferential surface of the boss receiving portion 323. The rotating member 330 has a receiving groove 333 recessed inwardly to accommodate the locking protrusion 324a. The interference protrusion 332a of the rotating member 330 may be configured as an interference protrusion 332a protruding toward the coupling boss 331 from the inner circumferential surface of the receiving groove 333.

4 to 6, the power transmission member 320 and the rotation member 330 is provided with a positioning portion which is a reference for adjusting the engagement position when they are coupled to each other. These positioning parts, the operator assembling the power transmission member 320 to the rotating member 330 to check the relative position of the rotating member 330 and the power transmission member 320 to move the power transmission member 320 in the correct position. Allow assembly.

The positioning portion of the rotating member 330 may be composed of a positioning hole 334 penetrating the rotating member 330 in the axial direction, the positioning portion of the power transmission member 320 positioning of the rotating member 330 It may be composed of a positioning hole 325 penetrating the power transmission member 320 in the axial direction at a position corresponding to the ball 334.

The operator rotates the power transmission member 320 after positioning the power transmission member 320 so that the positioning hole 325 of the power transmission member 320 and the positioning hole 334 of the rotation member 330 face each other. When coupled to the member 330, the engaging projection 324a of the power transmission member 320 and the interference projection 332a of the rotating member 330 is in a state as shown in FIG.

In addition, the rotating member 330 is provided with an elastic piece 335 formed on one side of the circumference, the power transmission member 320 is formed on one side of the inner peripheral surface of the receiving portion 322 corresponding to the elastic piece 335 The coupling groove 326 is provided. The elastic piece 335 is formed by cutting one side of the circumference of the rotating member 330. The free end of the elastic piece 335 is provided with a hook 335a protruding in the radial direction from the outer peripheral surface of the rotating member 330.

When the power transmission member 320 and the rotation member 330 are coupled as shown in FIG. 6, the hook 335a of the rotation member 330 is coupled to the coupling groove 326 of the power transmission member 320 so that the power transmission member ( Free rotation of 320 is suppressed. As such, fixing the power transmission member 320 to the rotation member 330 by using the elastic piece 335 and the coupling groove 326 is a power transmission member 320 and the rotation member 330 during distribution of the developer cartridge. This is to prevent the relative coupling relationship between) from changing.

Hereinafter, an operation of stirring the developer by the first stirring unit and the second stirring unit in the image forming apparatus according to the present invention will be described with reference to FIGS. 2 to 7. 7 is a view illustrating a state after the power transmission member rotates by a predetermined angle in the same state as in FIG. 6.

Before the developer cartridge 200 is mounted on the image forming apparatus and driven for the first time, the power transmission member 320 and the rotation member 330 are coupled in a state as shown in FIG. 6. That is, the locking protrusion 324a of the power transmission member 320 and the interference protrusion 332a of the rotation member 330 are spaced apart from each other by a predetermined angle θ with respect to the rotation direction (A direction) of the power transmission member 320.

In this state, when the developer cartridge 200 is mounted to the main body 10 and power is applied to the driving source 11, the rotational force is transmitted to the power transmission member 320 through the driving coupler 12 and the driven coupler 310. Delivered.

When the power transmission member 320 rotates, the power transmission gear 340 connected to the power transmission member 320 through the connection gear 350 rotates, and accordingly, the first stirring unit 220 rotates so that the developer storage chamber ( The developer in 210a) is stirred.

At this time, the elastic piece 335 of the rotating member 330 is coupled to the coupling groove 326 of the power transmission member 320 so that the rotational force is transmitted to the part of the rotating member 330, but within the developer storage chamber 210a. Since the load acting on the second stirring unit 230 is greater, the rotating member 330 may not rotate together with the power transmission member 320. Therefore, as the power transmission member 320 rotates, the elastic piece 335 of the rotating member 330 elastically deforms, and the hook 335a is separated from the coupling groove 326. In addition, since the locking projection 324a of the power transmission member 320 is spaced apart from the interference projection 332a of the rotation member 330 with respect to the rotational direction thereof, the power transmission member 320 is predetermined in relation to the rotation member 330. Idle for time.

As shown in FIG. 7, after the power transmission member 320 rotates by θ, the locking protrusion 324a of the power transmission member 320 interferes with the interference protrusion 332a of the rotation member 330. Then, the rotational force of the power transmission member 320 is transmitted to the rotating member 330, and accordingly, the second stirring unit 230 rotates together with the first stirring unit 220 to move the developer in the developer storage chamber 210a. Start to stir. Therefore, all the developer in the developer storage chamber 210a is agitated by the first stirring unit 220 and the second stirring unit 230, and the developer can be efficiently supplied toward the developer outlet 211.

As described above, in the present invention, the second stirring unit 230 starts to rotate in the state where the developer agglomeration phenomenon is partially resolved by the first stirring unit 220 which is pre-rotated, so that the first stirring unit 220 and the second stirring unit are stirred. As the unit 230 rotates at the same time, the first stirring unit 220 and the second stirring unit 230 may be prevented from being overloaded.

On the other hand, the above has been described an example in which the first stirring unit 220 installed relatively close to the developer discharge unit 211 to rotate first, on the contrary, the second stirring unit 230 to rotate first, the first It is also possible to configure the stirring unit 220 to rotate after a predetermined time. However, in general, when the stirring unit rotates, it is because the time to supply the developer to the developing unit 100 is imminent, and thus, the first stirring unit 220 adjacent to the developer discharge part 211 is first rotated. More preferably, the developer near the stirring unit 220 is first stirred in a state suitable for supplying the developer discharge part 211.

In addition, the above example has been described using two stirring units, but if the size of the developer storage chamber is large, three or more stirring units may be installed, and at least two of them may be rotated with a time difference from each other.

In addition, when two or three or more stirring units are installed, it is most preferable to use one driving source for cost reduction and structure simplification. It may be possible to use two or more drive sources to adjust the feed rate. However, in general, when n stirring units are provided, the driving source should be n-1 or less, which is efficient for cost reduction and structure simplification.

In addition, although the above-described developer cartridge is provided separately from the developing unit, and a plurality of stirring units are rotated with a time difference inside the developer cartridge, the developing unit and the developer cartridge are integrally formed according to the method. It is also possible to provide a plurality of stirring units inside the integrated cartridge. Even in this case, it is advantageous for the stirring unit close to the developer outlet to rotate first to efficiently stir or transfer the developer.

1 is a cross-sectional view showing the configuration of an image forming apparatus according to the present invention.

Figure 2 is a perspective view showing the configuration of a developer cartridge according to the present invention.

FIG. 3 is an enlarged view of some components of FIG. 2; FIG.

4 and 5 are a front perspective view and a rear perspective view showing a state in which the rotating shaft, the rotating member and the power transmission member of the second stirring unit in the present invention is coupled.

6 is a view showing the positional relationship between the rotating member and the power transmission member before the rotating member and the power transmission member are driven.

6 is a view showing a state after the power transmission member rotates a predetermined angle in the same state as in FIG.

* Description of symbols on the main parts of the drawings *

10: main body 11: drive source

40: developing device 200: developer cartridge

210: housing 210a: developer storage room

211: developer discharge unit 220: first stirring unit

230: second stirring unit 221: the rotating shaft of the first stirring unit

231: rotation axis of the second stirring unit 300: power transmission unit

320: power transmission member 324: locking portion

324a: locking projection 325: positioning hole

326: coupling groove 330: rotating member

332: interference unit 332a: interference protrusion

334: positioning hole 335: elastic piece

340: power transmission gear 350: connection gear

Claims (16)

A housing having a developer storage compartment; and A first stirring unit rotatably installed in the housing; and A second stirring unit rotatably installed in the housing and starting to rotate with a time difference from the first stirring unit; A developer cartridge comprising: The method of claim 1, The second stirring unit has a rotating shaft, And a rotating member coupled to one end of the rotating shaft, and a power transmitting member transmitting a rotating force to the rotating member after rotating a predetermined angle. The method of claim 2, And the rotary member and the power transmission member are coaxially coupled to each other. The method of claim 2, And the power transmission member has a locking portion for transmitting power to the rotating member, and the rotating member has an interference portion that interferes with the locking portion. The method of claim 2, And the rotation member and the power transmission member each have a positioning portion for aligning each other when the rotation member and the power transmission member are coupled to each other. The method of claim 2, The rotating member has a resilient piece formed on one side of the circumference, the power transmission member is a developer cartridge, characterized in that it has a coupling groove for engaging with the elastic piece. The method of claim 1, The developer storage chamber includes a developer discharge part through which a developer is discharged. And the first stirring unit is located closer to the developer discharging unit than the second stirring unit. The method of claim 1, And the first stirring unit and the second stirring unit are driven by a single drive source. Developer storage room; and A first stirring unit and a second stirring unit for stirring the developer in the developer storage chamber; and And a power transmission unit for transmitting rotational force to the first stirring unit and the second stirring unit. The power transmission unit includes a rotating member for transmitting rotational force to the second stirring unit, and a power transmission member for transmitting power to the first stirring unit and the rotating member, And the power transmission member transmits power to the rotating member after idling at a predetermined angle in relation to the rotating member. The method of claim 9, The second stirring unit has a rotating shaft, The rotating member is coupled coaxially to one end of the rotating shaft, And the power transmission member is rotatably coupled to the rotation member. The method of claim 10, The power transmission unit further includes a power transmission gear for transmitting power to the first stirring unit, And the power transmission member includes a gear portion for transmitting power to the power transmission gear and a receiving portion for receiving the rotation member. The method of claim 11, The power transmission member further comprises a locking projection formed on the receiving portion, wherein the rotating member has an interference projection to interfere with the locking projection in a state in which the power transmission member is rotated by a predetermined angle. The method of claim 9, The rotating member has a first positioning hole, And the power transmission member has a second positioning hole corresponding to the first positioning hole. Developer storage room; and A first stirring unit and a second stirring unit rotating in the developer storage chamber and stirring the developer; and A driving source for driving the first stirring unit and the second stirring unit; and A power transmission gear for transmitting power to the first stirring unit; and Rotating member for transmitting power to the second stirring unit; And A power transmission member for transferring the power transmitted from the driving source to the power transmission gear and the rotating member with a time difference; And an image forming apparatus. The method of claim 14, The rotating member and the power transmission member are coupled coaxially, The power transmission member has a locking projection for transmitting power to the rotating member, And the rotating member includes an interference protrusion spaced apart from the locking protrusion in a rotational direction of the power transmission member. The method of claim 14, The rotating member has an elastic piece having a first positioning hole and a hook, And the power transmission member has a second positioning hole and a coupling groove which engages with the hook of the elastic piece when the positions of the first positioning hole and the second positioning hole are aligned.

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